STOCK COMPENSATION PLANS (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) Director $ / shares shares	Mar. 31, 2016 USD ($)	May 04, 2016 $ / shares shares	Dec. 18, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of directors in committee | Director	3
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Class A Stock [Member] | 2015 Equity Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense | $	$ 34,000	$ 0
Unrecognized expense related to non-vested option shares | $	$ 0
Number of shares authorizes under the plan (in shares) | shares			5,000	5,000
Fair market value (in dollars per share) | $ / shares			$ 27.70	$ 27.38
Class A Stock [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period, option shares (in shares) | shares	231,755
Granted, option shares (in shares) | shares	0
Exercised/vested and released, option shares (in shares) | shares	(11,500)
Expired, option shares (in shares) | shares	0
Outstanding at end of period, option shares (in shares) | shares	220,255
Exercisable/vested at end of period, option share (in shares) | shares	220,255
Shares of Class A Non-Voting Common Stock under option [Abstract]
Outstanding at beginning of period, weighted average exercise price (in dollars per shares) | $ / shares	$ 19.32
Granted, weighted average exercise price (in dollars per share) | $ / shares	0
Exercised/vested and released, weighted average exercise price (in dollars per shares) | $ / shares	19.09
Expired/cancelled, weighted average exercise price (in dollars per share) | $ / shares	0
Outstanding at end of period, weighted average exercise price (in dollars per shares) | $ / shares	19.33
Exercisable/vested at end of period, weighted average exercise price (in dollars per shares) | $ / shares	$ 19.33
Outstanding at end of period, weighted average remaining life	4 years 4 months 2 days
Exercisable/vested at end of period, weighted average remaining life	4 years 4 months 2 days
Outstanding at beginning of period, aggregate intrinsic value | $	$ 2,925,000
Granted, aggregate intrinsic value | $	0
Exercised/ vested and released, aggregate intrinsic value | $	158,000
Expired/cancelled, aggregate intrinsic value | $	0
Outstanding at end of period, aggregate intrinsic value | $	2,914,000
Exercisable/vested at end of period, aggregate intrinsic value | $	$ 2,914,000
Class A Stock [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period, option shares (in shares) | shares	5,000
Granted, option shares (in shares) | shares	0
Exercised/vested and released, option shares (in shares) | shares	0
Expired, option shares (in shares) | shares	0
Outstanding at end of period, option shares (in shares) | shares	5,000
Exercisable/vested at end of period, option share (in shares) | shares	0
Shares of Class A Non-Voting Common Stock under option [Abstract]
Outstanding at beginning of period, weighted average exercise price (in dollars per shares) | $ / shares	$ 27.70
Granted, weighted average exercise price (in dollars per share) | $ / shares	0
Exercised/vested and released, weighted average exercise price (in dollars per shares) | $ / shares	0
Expired/cancelled, weighted average exercise price (in dollars per share) | $ / shares	0
Outstanding at end of period, weighted average exercise price (in dollars per shares) | $ / shares	27.70
Exercisable/vested at end of period, weighted average exercise price (in dollars per shares) | $ / shares	$ 0
Class A Stock [Member] | Restricted Stock [Member] | 2015 Equity Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense related to non-vested option shares | $	$ 12,500
Period over which unvested options cost will recognized	1 month 2 days